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Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial...
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A urine culture and sensitivity test is a diagnostic procedure used to identify urinary tract bacterial infections and determine the most effective antibiotics for treatment. This test is generally preferred when a patient shows manifestations of a urinary tract infection, such as frequent or painful urination, cloudy or foul-smelling urine, or lower abdominal pain.Purpose of the TestThe primary goals of a urine culture and sensitivity test are to:Determine the specific bacteria causing the...
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Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin,...
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Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These...
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Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...
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Diagnosing NSAID-Hypersensitivity/Allergy and NSAID-Exacerbated or Induced Food Allergy Phenotypes in Children and Adolescents.

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Basophil Activation Test for Allergy Diagnosis
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Cefazolin Hypersensitivity: Toward Optimized Diagnosis.

Astrid P Uyttebroek1, Ine I Decuyper2, Chris H Bridts1

  • 1Department of Immunology, Allergology, Rheumatology, Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp University Hospital, Antwerp, Belgium.

The Journal of Allergy and Clinical Immunology. in Practice
|June 19, 2016
PubMed
Summary
This summary is machine-generated.

Diagnosing cefazolin hypersensitivity is improved by increasing skin test concentration to 20 mg/mL, enhancing sensitivity. This study also confirms cefazolin allergy is typically selective, with good tolerance to other beta-lactam antibiotics.

Keywords:
Cefazolin hypersensitivityCross-reactivityPerioperative anaphylaxisSkin testing

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Area of Science:

  • Clinical immunology
  • Pharmacology
  • Dermatology

Background:

  • Accurate diagnosis of cefazolin hypersensitivity is challenging due to a lack of in vitro tests and uncertainty regarding optimal skin test concentrations.
  • Existing cross-reactivity studies suggest that cefazolin hypersensitivity may be a selective form of allergy.

Purpose of the Study:

  • To evaluate if a higher test concentration (20 mg/mL) of cefazolin increases skin test sensitivity for diagnosing hypersensitivity.
  • To investigate the cross-reactivity patterns between cefazolin and other beta-lactam antibiotics in patients with suspected hypersensitivity.

Main Methods:

  • 66 patients with perioperative anaphylaxis exposed to cefazolin underwent skin testing with cefazolin up to 20 mg/mL.
  • Positive skin test responders were further evaluated with a panel of beta-lactam skin tests and graded drug challenges to assess cross-reactivity.
  • Control group of 30 cefazolin-exposed individuals with identified alternative anaphylaxis culprits underwent testing with 20 mg/mL cefazolin to assess irritation.

Main Results:

  • Increasing cefazolin skin test concentration from 2 mg/mL to 20 mg/mL identified an additional 27% of patients (7/19) with hypersensitivity.
  • The 20 mg/mL concentration was found to be non-irritating in control subjects.
  • All patients with negative skin tests tolerated alternative beta-lactam antibiotics, including cephalosporins, monobactams, and carbapenems, with 11 tolerating alternative cephalosporins.

Conclusions:

  • Higher cefazolin concentrations (up to 20 mg/mL) for skin testing significantly improve diagnostic sensitivity for cefazolin hypersensitivity.
  • Cefazolin hypersensitivity appears to be a selective allergy, as patients generally tolerate other beta-lactam antibiotics well.